In the Eastern Church three Doctors were pre-eminent: St. John Chrysostom, St. Basil, and St. Gregory Nazianzen. The feasts of these three saints were made obligatory throughout the Eastern Empire by Leo VI, the Wise, the deposer of Photius. A common feast was later instituted in their honour on 30 January, called "the feast of the three Hierarchs". In the Menaea for that day it is related that the three Doctors appeared in a dream to John, Bishop of Euchaitae, and commanded him to institute a festival in their honour, in order to put a stop to the rivalries of their votaries and panegyrists. This was under Alexius Comnenus (1081-1118; see "Acta SS.", 14 June, under St. Basil, c. xxxviii). But sermons for the feast are attributed in manuscripts to Cosmas Vestitor, who flourished in the tenth century. The three are as common in Eastern art as the four are in Western. Durandus (i, 3) remarks that Doctors should be represented with books in their hands. In the West analogy led to the veneration of four Eastern Doctors, St. Athanasius being very properly added to the three hierarchs.

To these great names others have subsequently been added. The requisite conditions are enumerated as three: eminens doctrina, insignis vitae sanctitas, Ecclesiae declaratio (i.e. eminent learning, a high degree of sanctity, and proclamation by the Church). Benedict XIV explains the third as a declaration by the supreme pontiff or by a general council. But though general councils have acclaimed the writings of certain Doctors, no council has actually conferred the title of Doctor of the Church. In practice the procedure consists in extending to the universal church the use of the Office and Mass of a saint in which the title of doctor is applied to him. The decree is issued by the Congregation of Sacred Rites and approved by the pope, after a careful examination, if necessary, of the saint's writings. It is not in any way an ex cathedra decision, nor does it even amount to a declaration that no error is to be found in the teaching of the Doctor. It is, indeed, well known that the very greatest of them are not wholly immune from error. No martyr has ever been included in the list, since the Office and the Mass are for Confessors. Hence, as Benedict XIV points out, St. Ignatius, St. Irenæus, and St. Cyprian are not called Doctors of the Church.

The proper Mass of Doctors has the Introit "In medio", borrowed from that of the Theologus par excellence, St. John the Evangelist, together with special prayers and Gospel. The Credo is said. The principal peculiarity of the Office is the antiphon to the Magnificat at both Vespers, "O DOCTOR OPTIME", and it is rather by this antiphon than by the special mass that a saint is perceived to be a doctor (S.R.C., 7 Sept., 1754). In fact, St. John Damascene has a Mass of his own, while Athanasius, Basil, Leo, and Cyril of Jerusalem have not the Gospel of Doctors, and several have not the collect.

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